#include<iostream>

#include<fstream>

#include<stdio.h>




using namespace std;

class Employee{

    private:

        int code;

        char name[20];

        float salary;

    public:

        void read();

        void display();

       

        int getEmpCode()            { return code;}

       

        int getSalary()             { return salary;}

       

        void updateSalary(float s)  { salary=s;}

};







void Employee::read(){

    cout<<"Enter employee code: ";

    cin>>code;

    cout<<"Enter name: ";

    cin.ignore(1);

    cin.getline(name,20);

    cout<<"Enter salary: ";

    cin>>salary;

}







void Employee::display()

{

    cout<<code<<" "<<name<<"\t"<<salary<<endl;

}







fstream file;




void deleteExistingFile(){

    remove("EMPLOYEE.DAT");

}




void appendToFille(){

    Employee    x;

    

    x.read();

    

    file.open("EMPLOYEE.DAT",ios::binary|ios::app);

    if(!file){

        cout<<"ERROR IN CREATING FILE\n";

        return;

    }

    file.write((char*)&x,sizeof(x));

    file.close();

    cout<<"Record added sucessfully.\n";

}




void displayAll(){

    Employee    x;

    

    file.open("EMPLOYEE.DAT",ios::binary|ios::in);

    if(!file){

        cout<<"ERROR IN OPENING FILE \n";

        return;

    }

    while(file){

    if(file.read((char*)&x,sizeof(x)))

        if(x.getSalary()>=10000 && x.getSalary()<=20000)

            x.display();

    }

  file.close();

}




void searchForRecord(){

    Employee    x;

    int c;

    int isFound=0;




    cout<<"Enter employee code: ";

    cin>>c;







    file.open("EMPLOYEE.DAT",ios::binary|ios::in);

    if(!file){

        cout<<"ERROR IN OPENING FILE \n";

        return;

    }

    while(file){

        if(file.read((char*)&x,sizeof(x))){

            if(x.getEmpCode()==c){

                cout<<"RECORD FOUND\n";

                x.display();

                isFound=1;

                break;

            }

        }

    }

    if(isFound==0){

        cout<<"Record not found!!!\n";

    }

    file.close();

}




void increaseSalary(){

    Employee    x;

    int c;

    int isFound=0;

    float sal;




    cout<<"enter employee code \n";

    cin>>c;







    file.open("EMPLOYEE.DAT",ios::binary|ios::in);

    if(!file){

        cout<<"ERROR IN OPENING FILE \n";

        return;

    }

    while(file){

        if(file.read((char*)&x,sizeof(x))){

            if(x.getEmpCode()==c){

                cout<<"Salary hike? ";

                cin>>sal;

                x.updateSalary(x.getSalary()+sal);

                isFound=1;

                break;

            }

        }

    }

    if(isFound==0){

        cout<<"Record not found!!!\n";

    }

    file.close();

    cout<<"Salary updated successfully."<<endl;

}




void insertRecord(){

    Employee    x;

    Employee newEmp;

    

    newEmp.read();




    fstream fin;

    file.open("EMPLOYEE.DAT",ios::binary|ios::in);

    fin.open("TEMP.DAT",ios::binary|ios::out);




    if(!file){

        cout<<"Error in opening EMPLOYEE.DAT file!!!\n";

        return;

    }

    if(!fin){

        cout<<"Error in opening TEMP.DAT file!!!\n";

        return;

    }

    while(file){

        if(file.read((char*)&x,sizeof(x))){

            if(x.getEmpCode()>newEmp.getEmpCode()){

                fin.write((char*)&newEmp, sizeof(newEmp));

            }

   

            fin.write((char*)&x, sizeof(x));

        }

    }




    fin.close();

    file.close();

    

    rename("TEMP.DAT","EMPLOYEE.DAT");

    remove("TEMP.DAT");

    cout<<"Record inserted successfully."<<endl;

}




int main()

{

     char ch;




     deleteExistingFile();




     do{

     int n;




     cout<<"ENTER CHOICE\n"<<"1.ADD AN EMPLOYEE\n"<<"2.DISPLAY\n"<<"3.SEARCH\n"<<"4.INCREASE SALARY\n"<<"5.INSERT RECORD\n";

     cout<<"Make a choice: ";

     cin>>n;




     switch(n){

          case 1:

            appendToFille();

            break;

          case 2 :

            displayAll();

            break;

          case 3:

            searchForRecord();

            break;

        case 4:

            increaseSalary();

            break;

        case 5:

            insertRecord();

            break;




          default :

                cout<<"Invalid Choice\n";

     }




     cout<<"Do you want to continue ? : ";

     cin>>ch;




     }while(ch=='Y'||ch=='y');

    

    return 0;

}

#include<iostream>
#include<fstream>
#include<string.h>

using namespace std;
void addemployee();
void showemployee();

class employee {

int employee_id;
string employee_name;
int employee_salary;
public:
employee(){

}
void setid(int id){
employee_id=id;
}
void setname(string name){
employee_name=name;
}

void setsalary(int salary){
employee_salary=salary;
}
int getid(){
return this->employee_id;
}
string getname(){
return this->employee_name;
}
int getsalary(){
return this->employee_salary;
}
};
employee anEmployee;
void addemployee(){
int id;
cout<<"enter employee ID: ";
cin>>id;
anEmployee.setid(id);
cout<<"enter employee Name: ";
string name;
cin>>name;
anEmployee.setname(name);
int salry;

cout<<"enter employee Salary: ";
cin>>salry;
anEmployee.setsalary(salry);
ofstream empfile("employee.txt",ios::binary|ios::app);

if(!empfile) {
cout << "Cannot open file!" << endl;
return ;
}
empfile.write((char*)&anEmployee, sizeof(employee));
//cout<<anEmployee.getid()<<" "<<anEmployee.getname()<<"
"""<<anEmployee.getsalary();
empfile.close();
if(!empfile.good()) {
cout << "Error occurred at writing time!" << endl;
return ;
}
cout << "Employee Recored added Sucessfully!" << endl;
}

void displayRecord() {
// employee anEmployee;
ifstream file("employee.txt",ios::binary);
if(!file) {

cout<<"Error in opening file.\n";
return;
} else {
cout<<"ID"<<" "<<"Name"<<"\t"<<"Salary"<<endl;
cout<<"======================================================="<<en
dl;
while(file.read((char*)&anEmployee,sizeof(employee))) {

cout<<anEmployee.getid()<<"
"<<anEmployee.getname()<<"\t"<<anEmployee.getsalary();
cout<<endl;
}
file.close();
}
}

// function to show employee data
void updateSalary() {
fstream file("employee.txt",ios::binary|ios::in|ios::out);
if(!file) {
cout<<"Error in opening file.\n";
return;
}
int eCode,sHike;

cout<<"Enter employee code\n";
cin>>eCode;
cout<<"Salary hike? ";
cin>>sHike;
file.seekg(sizeof(anEmployee)*(eCode-1),ios::beg);
file.read((char*)&anEmployee,sizeof(employee));
anEmployee.setsalary(sHike+anEmployee.getsalary());
file.seekp(sizeof(anEmployee)*(eCode-1),ios::beg);
file.write((char*)&anEmployee,sizeof(employee));
cout<<"Salary updated successfully.\n";
}
main()
{
ifstream file("employee.txt");
if(file) {
file.close();
remove("employee.txt");
}
int programOption;
while(true){

cout<<"\n\n\n";
cout<<"Please select the option Below,.\n";
cout<<"Please enter 1 To ADD AN EMPLOYEE.\n";

cout<<"Please enter 2 To DISPLAY FILE DATA..\n";
cout<<"Please enter 3 To INCREASE EMPLOYEE SALARY..\n";
cout<<"Please enter 4 To Exit Program..\n";

cout<<"============================================================
======\n";
cout<<"Please enter program option :";
cin>>programOption;

switch(programOption){
case 1 :
cout<<"ADD AN EMPLOYEE DATA.\n";
addemployee();
break;
case 2 :
cout<<"Showing Employee Data.\n";
displayRecord();
break;
case 3 :
cout<<"Update salary .\n";
updateSalary();
break;
case 4 :
cout<<"Shuting Down the Program......\n";

exit(1);
break;

}
}
}